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Articles 11251 - 11280 of 35665
Full-Text Articles in Entire DC Network
Ichetucknee Springs: Measuring The Effects Of Visitors On Water Quality Parameters Through Continuous Monitoring., Sarah Faraji
Ichetucknee Springs: Measuring The Effects Of Visitors On Water Quality Parameters Through Continuous Monitoring., Sarah Faraji
Electronic Theses and Dissertations
Ichetucknee Springs System is in north central Florida, under the jurisdiction of the Suwannee River Water Management District (SRWMD). The Ichetucknee River is one of the most pristine spring-fed rivers in Florida and became a state park in 1970. Over 400,000 people visited the Ichetucknee Springs State Park in 2016. From that total, over 130,000 people came during the tubing season alone (Memorial Day to Labor Day). During the tubing season, only 750 visitors per day are allowed to launch from the North Launch, near the Ichetucknee Head Spring. The park enforces visitor usage of the river during these time …
Detection Of Inorganic Phosphate In Environmental Water Samples Using A Terbium And Gold Nanoparticle-Based Fret Chemosensor, Madeleine Johnson
Detection Of Inorganic Phosphate In Environmental Water Samples Using A Terbium And Gold Nanoparticle-Based Fret Chemosensor, Madeleine Johnson
Electronic Theses and Dissertations
A novel chemosensor for the detection of inorganic phosphate (Pi) in environmental water samples is outlined. The sensing solution is comprised of a luminescent lanthanide, terbium (Tb3+), chelated to ethylenediaminetetraacetic acid (EDTA) acid in solution with cetyltrimethylammonium bromide (CTAB)- capped gold nanoparticles (AuNPs). The Tb-EDTA and AuNPs undergo a Fluorescence resonance energy transfer (FRET) mechanism in which the Tb3+ luminescence is quenched. Upon the addition of inorganic phosphate (Pi), the AuNPs begin to aggregate and precipitate out of solution. The aggregation of AuNPs results in the restoration of the Tb-EDTA signal which can then be correlated to Pi concentration in …
Mucking About: Hydrologic Regime And Soil Carbon Storage In Restored Subtropical Wetlands, Alicia Huber
Mucking About: Hydrologic Regime And Soil Carbon Storage In Restored Subtropical Wetlands, Alicia Huber
Electronic Theses and Dissertations
Wetlands are extremely important ecosystems that have declined drastically worldwide, continue to be lost, and are threatened globally. They perform a number of important ecosystem services such as flood control, provide habitat for many species, and have aesthetic and recreational value. Wetlands are also important to the global carbon (C) cycle. Wetland soils are especially effective C sinks because they have high primary productivity and low decomposition rates due to flooded, anoxic conditions. Increased recognition of wetlands' value has led to more ecological and hydrological restoration of degraded wetlands to mitigate the effects of wetland destruction. Hydrological restoration, which attempts …
High Performance Liquid Crystals For Displays And Spatial Light Modulators, Fenglin Peng
High Performance Liquid Crystals For Displays And Spatial Light Modulators, Fenglin Peng
Electronic Theses and Dissertations
Liquid crystals (LCs) are an amazing class of soft materials which have been widely used in the visible, infrared (IR), millimeter wave, and terahertz spectral regions. Both amplitude modulation (e.g. displays) and phase modulation (e.g. spatial light modulators (SLMs) for adaptive optics and adaptive lens) have been investigated extensively. Thin-film-transistor liquid crystal displays (TFT-LCDs) have become ubiquitous in our daily lives. Its widespread applications span from TVs, monitors, tablets, smartphones, augmented reality, virtual reality, to vehicle displays. LCD shows advantages in 1) high resolution, 2) long lifetime, 3) vivid colors using quantum dots backlight, and 4) high dynamic contrast ratio …
Mode Evolution In Fiber Based Devices For Optical Communication Systems, Bin Huang
Mode Evolution In Fiber Based Devices For Optical Communication Systems, Bin Huang
Electronic Theses and Dissertations
Space division multiplexing (SDM) is the most promising way of increasing the capacity of a single fiber. To enable the few mode fiber (FMF) or multi-mode fiber (MMF) transmission system, several major challenges have to be overcome. One is the urgent need of ideal mode multiplexer, the second is the perfect amplification for all spatial modes, another one is the modal delay spread (MDS) due to group velocity difference of spatial modes. The main subject of this dissertation is to model, fabricate and characterize the mode multiplexer for FMF transmission. First, we designed a novel resonant mode coupler (structured directional …
Characterization Of Novel Borrelia Burgdorferi Transcripts Expressed During Tick And Mammalian Infection, Philip Adams
Characterization Of Novel Borrelia Burgdorferi Transcripts Expressed During Tick And Mammalian Infection, Philip Adams
Electronic Theses and Dissertations
The purpose of this dissertation is to characterize the transcriptome of Borrelia (Borreliella) burgdorferi to discover novel transcripts, important for pathogenesis. As a spirochete and the etiological agent of Lyme disease, the foremost vector-borne bacterial infection in the world, B. burgdorferi fulfills a distinctive niche among bacterial pathogens. Persisting in the disparate environments of a tick vector and mammalian reservoirs, it is absolutely dependent on its hosts for transmission and nutrient acquisition. B. burgdorferi harbors a complex fragmented genome which is largely linear, unlike that of most prokaryotes, lacks an array of classically described metabolic genes, and contains an unusually …
The Microbial Ecosystem Of Beer Spoilage And Souring: Competition And Cooperation In The Age Of Bioinformatics, Andrew Kettring
The Microbial Ecosystem Of Beer Spoilage And Souring: Competition And Cooperation In The Age Of Bioinformatics, Andrew Kettring
Electronic Theses and Dissertations
The brewing industry generates $350 billion in revenue in the US annually, representing 1.9% of the gross domestic product. Spoilage is a persistent problem throughout production and distribution that causes economic loss, and is therefore meticulously avoided. Contrarily, artisanal sour beers are necessarily produced by a diverse variety of these spoilage organisms metabolically interacting in symbiosis as a microbial ecosystem. We sought to gain insight into factors driving assembly of microbial communities by testing a long-debated Darwinian hypothesis. A collection of community members were screened in co-culture and novel bioinformatics tools were developed to predict observed interactions. A fundamental understanding …
Effects Of Collaboration Between Speech-Language Pathologists And Third-Grade Teachers On Student Vocabulary Outcomes, Mary Mitchell
Effects Of Collaboration Between Speech-Language Pathologists And Third-Grade Teachers On Student Vocabulary Outcomes, Mary Mitchell
Electronic Theses and Dissertations
A persistent literacy crisis continues to be reflected in international (Organisation for Economic Co-operation and Development [OECD], 2013), national (National Center for Education Statistics [NCES], 2015), and local literacy outcome data. Educators, including speech-language pathologists (SLPs), are called upon to collaborate to support students who struggle with academic language/literacy. However, few studies have operationally defined collaboration and investigated the effects of collaboration on student achievement. As a result, there is insufficient guidance for educators about ways to design, implement, and assess the effectiveness of collaboration models, defined in terms of their effects on student outcomes. There were two main objectives …
A Comparative Study Of Student Performance, Attendance, And Discipline In A Community School In A Large Urban School District In The Southern United States, Juanita Morrow
Electronic Theses and Dissertations
The goal of this research was to investigate the impact of the community school practices such as extended/supplemental enrichment time, character development, anger management, counseling, tutoring, and mental and physical healthcare on student performance, attendance and discipline at a community school in a large urban school district in the southern U.S. The select population and sample for this study was the school's 2011-2012 senior cohort, before the school's implementation of community school practices and the school's 2015-2016 senior cohort, after implementation of community school practices at the select community school. In an effort to more accurately determine the effectiveness of …
Crafting Craft Beer Brands: An Examination Of Identity, Community, And Growth In Orlando Area Craft Breweries, Dylan Fehribach
Crafting Craft Beer Brands: An Examination Of Identity, Community, And Growth In Orlando Area Craft Breweries, Dylan Fehribach
Electronic Theses and Dissertations
Beer is a commodity that has been produced and consumed by humans for millennia. Within the U.S., the craft beer industry has grown considerably over the last decade, accounting for 19% of all beers sales in 2014. Despite this increased market presence, craft beer marketing and production has received little anthropological consideration. To address this dearth of case studies, I consider the local craft brewery scene, or area of activity, in Orlando Florida. My 2016 ethnographic research reveals that the local craft brewery scene exhibits both variation in identity and community locations. Interactions among breweries present opportunities for local breweries …
The Influences Of Mindfulness And Neuromotor Exercise Mode On Balance In Healthy Older Adults, Maxine Hicks
The Influences Of Mindfulness And Neuromotor Exercise Mode On Balance In Healthy Older Adults, Maxine Hicks
Electronic Theses and Dissertations
This study investigated the roles of mindfulness and balance to optimize strategies for fall prevention in healthy older adults. The purpose of this study was to examine the association of mindfulness with respect to balance in healthy older adults who are experienced in meditative versus non-meditative modes of neuromotor exercise. This was a comparative descriptive study that used a convenience sample of N=86 older adults (20 male; mean age = 69.33 ± 7.24; range: 60 – 93 years). The sample included experienced participants of meditative (e.g., yoga, Tai chi) and non-meditative (e.g., partnered dance) neuromotor exercise recruited from community yoga, …
Plasticity Of Central And Peripheral Nervous System: Effects Of Oxygen-Glucose Deprivation (Ogd) And Chronic Intermittent Hypoxia (Cih), Jin Chen
Electronic Theses and Dissertations
Transient receptor potential canonical 6 (TRPC6) channels are permeable to Na+ and Ca2+ and are widely expressed in the brain. In this study, we investigated the role of TRPC6 following ischemia/reperfusion (I/R) and oxygen-glucose deprivation (OGD). We found that TRPC6 expression was increased in wild type (WT) mice cortical neurons following I/R and in primary neurons with OGD, and that deletion of TRPC6 reduced the I/R-induced brain infarct in mice and the OGD- /neurotoxin-induced neuronal death. Using live-cell imaging to examine intracellular Ca2+ levels ([Ca2+]i), we found that OGD induced a significant higher increase in glutamate-evoked Ca2+ influx compared to …
Computational Fluid Dynamics Proof Of Concept And Analysis Of A Self-Powered Fontan Circulation, Marcus Ni
Computational Fluid Dynamics Proof Of Concept And Analysis Of A Self-Powered Fontan Circulation, Marcus Ni
Electronic Theses and Dissertations
The Fontan circulation is a result of the last (third stage) surgical procedure to correct a single ventricle congenital cardiac disorder in children. Although the Fontan circulation has been successfully established in surgeries over the years, it is flawed and can lead in certain cases to pre-mature death. The main cause of this failure is due to increased pulmonary vascular resistance due to loss pulse pressure and blood flow. In healthy circulations, the heart pumps directly to the lungs, where as "Single Ventricle" patients must use a single sided heart to supply blood to the rest of the body before …
Improved Multi-Task Learning Based On Local Rademacher Analysis, Niloofar Yousefi
Improved Multi-Task Learning Based On Local Rademacher Analysis, Niloofar Yousefi
Electronic Theses and Dissertations
Considering a single prediction task at a time is the most commonly paradigm in machine learning practice. This methodology, however, ignores the potentially relevant information that might be available in other related tasks in the same domain. This becomes even more critical where facing the lack of a sufficient amount of data in a prediction task of an individual subject may lead to deteriorated generalization performance. In such cases, learning multiple related tasks together might offer a better performance by allowing tasks to leverage information from each other. Multi-Task Learning (MTL) is a machine learning framework, which learns multiple related …
Jml Template Generation, Kushal Raghav Poojari
Jml Template Generation, Kushal Raghav Poojari
Electronic Theses and Dissertations
The Java Modeling Language (JML) is a behavioral interface specific language designed to specify Java modules (which are Java classes and interfaces). Specifications are used to describe the intended functionality without considering the way it is implemented. In JML, if a user wants to write specifications for a Java file, he or she must undertake several steps. To help automate the process of creating annotations for method specifications, a tool Jmlspec was created. Jmlspec generated a file that refines the source file and has empty placeholders in which one can write specifications. Although Jmlspec worked with older versions of Java, …
Wrong-Way Driving: A Regional Approach To A Regional Problem, Md. Omar Faruk
Wrong-Way Driving: A Regional Approach To A Regional Problem, Md. Omar Faruk
Electronic Theses and Dissertations
Wrong-way driving (WWD) has been problematic on United States highways for decades despite its rare occurrence. Since WWD crashes are rare, recent researchers have studied WWD non-crash events such as WWD 911 calls and WWD citations to understand the overall nature and trend of WWD. This paper demonstrates the regional nature of the WWD problem and proposes regional transportation systems management and operations (Regional TSM&O) solutions to combat this problem. Specifically, it was found that 11% of all WWD multi-data events (e.g., multiple 911 calls for the same WWD event) traveled from one county to another. Additionally, 30% of all …
Polyelectrolyte And Hydrogel Stabilized Liquid Crystal Droplets For The Detection Of Bile Acids, Jinan Deng
Polyelectrolyte And Hydrogel Stabilized Liquid Crystal Droplets For The Detection Of Bile Acids, Jinan Deng
Electronic Theses and Dissertations
Liquid crystal (LC) droplets show great potential as an optical probe for sensor applications due to their large surface areas and stimuli-response director configurations. Bile acids with amphipathic properties, which are formed in liver and secreted into the small intestine, play an important role in the digestion of fats and fat-soluble vitamins. After the digestion process, most of bile acids are recycled back to the liver and ready for the next digestion. Only a few of them are excreted into body fluids. However, there is significant increases in the concentration level of bile acids in body fluids for patients with …
Visual Saliency Detection And Semantic Segmentation, Nasim Souly
Visual Saliency Detection And Semantic Segmentation, Nasim Souly
Electronic Theses and Dissertations
Visual saliency is the ability to select the most relevant data in the scene and reduce the amount of data that needs to be processed. We propose a novel unsupervised approach to detect visual saliency in videos. For this, we employ a hierarchical segmentation technique to obtain supervoxels of a video, and simultaneously, we build a dictionary from cuboids of the video. Then we create a feature matrix from coefficients of dictionary elements. Next, we decompose this matrix into sparse and redundant parts and obtain salient regions using group lasso. Our experiments provide promising results in terms of predicting eye …
Ellipsometric Measurements Of Alternative Fuels, Leigh Nash
Ellipsometric Measurements Of Alternative Fuels, Leigh Nash
Electronic Theses and Dissertations
Alternative jet fuels will be important in the future to ensure cleaner burning, reliable, and reasonably priced air transportation. One important property that must meet certification standards is the fuel's thermal stability, or its ability to withstand heating before breaking down. Jet fuels are used as engine coolants, and thermally unstable fuels can form deposits in the fuel delivery systems, leading to a loss of fuel flow. In the past, the thermal stability of a fuel was rated using a color standard method. The color of the deposit left on a metal tube that had been heated and exposed to …
Reliable Spectrum Hole Detection In Spectrum-Heterogeneous Mobile Cognitive Radio Networks Via Sequential Bayesian Non-Parametric Clustering, Alireza Zaeemzadeh
Reliable Spectrum Hole Detection In Spectrum-Heterogeneous Mobile Cognitive Radio Networks Via Sequential Bayesian Non-Parametric Clustering, Alireza Zaeemzadeh
Electronic Theses and Dissertations
In this work, the problem of detecting radio spectrum opportunities in spectrum-heterogeneous cognitive radio networks is addressed. Spectrum opportunities are the frequency channels that are underutilized by the primary licensed users. Thus, by enabling the unlicensed users to detect and utilize them, we can improve the efficiency, reliability, and the flexibility of the radio spectrum usage. The main objective of this work is to discover the spectrum opportunities in time, space, and frequency domains, by proposing a low-cost and practical framework. Spectrum-heterogeneous networks are the networks in which different sensors experience different spectrum opportunities. Thus, the sensing data from sensors …
Analysis Of Pedestrian Crash Characteristics And Contributing Causes In Central Florida, Zainb Bianco
Analysis Of Pedestrian Crash Characteristics And Contributing Causes In Central Florida, Zainb Bianco
Electronic Theses and Dissertations
This research investigates the main reasons leading the State of Florida to be ranked among the worst states in terms of pedestrian safety with four metro areas considered the most dangerous for pedestrians among all the United States as reported in the Dangerous by Design report. The study analyzes the characteristics and contributing causes of pedestrian crashes that occurred in Central Florida over a 5 year-period (2011-2015) at intersections and along roadway segments at mid-block locations using the data obtained from the Signal 4 Analytics database. All pedestrian related crashes were compiled and all the 6,789 crash reports were studied …
Wearable Passive Wireless Mems Respiration Sensor, Sina Moradian
Wearable Passive Wireless Mems Respiration Sensor, Sina Moradian
Electronic Theses and Dissertations
In this study a passive sensor that wirelessly monitors the profile of the human respiratory system is presented. The sensor was designed to be wearable, weighs less than 10 grams and is durable. The sensor is made of a RF piezoelectric MEMS resonator and an ultra-high frequency antenna made of a thin metal film formed on a flexible substrate . The resonance frequency of the TPoS resonator shifts as a function of condensation and evaporation of water vapor on the surface of the resonator and changes in resonator's temperature. These parameters change in each in response to inspiration and expiration …
Characteristics Of Hydrogel-Wetted Thin Films, James Owens
Characteristics Of Hydrogel-Wetted Thin Films, James Owens
Electronic Theses and Dissertations
The meniscus region of a thin film is known to have high heat transfer properties due to high evaporation rates and activation of latent heat. The region known as the thin film meniscus (δfilm lt& 2 µm ) can account for more than half of the total heat transfer of a droplet or film. This study focuses on the potential elongation and curvature amplification of the thin film meniscus region by the implementation of a layer of high hydrogen bonding (hydrogel) film on which the liquid meniscus is built. Forced wetting via liquid propagation though this hydrogel layer in the …
Designing Light Filters To Detect Skin Using A Low-Powered Sensor, Muhammad Uzair Tariq
Designing Light Filters To Detect Skin Using A Low-Powered Sensor, Muhammad Uzair Tariq
Electronic Theses and Dissertations
Detection of nudity in photos and videos, especially prior to uploading to the internet, is vital to solving many problems related to adolescent sexting, the distribution of child pornography, and cyber-bullying. The problem with using nudity detection algorithms as a means to combat these problems is that: 1) it implies that a digitized nude photo of a minor already exists (i.e., child pornography), and 2) there are real ethical and legal concerns around the distribution and processing of child pornography. Once a camera captures an image, that image is no longer secure. Therefore, we need to develop new privacy-preserving solutions …
Mid-Infrared Absorption Spectrometer For Multi-Species Detection Using Leds For Space Applications: Development And Flight Testing, Michael Villar
Mid-Infrared Absorption Spectrometer For Multi-Species Detection Using Leds For Space Applications: Development And Flight Testing, Michael Villar
Electronic Theses and Dissertations
As commercial space travel expands, the need for specialized instrumentation to ensure the safety of crew and cargo becomes increasingly necessary. Both the Federal Aviation Administration (FAA) and pioneers in the space tourism industry have expressed an interest in a robust, low cost, and low power consumption sensor to measure atmospheric composition aboard spacecraft. To achieve this goal a time-resolved NDIR absorption sensor that measures transient levels of gaseous carbon dioxide (CO2) and carbon monoxide (CO) was developed. The developed sensor has a wide range of applications applicable to the growing needs of industry, from monitoring CO and CO2 levels …
High Performance Techniques For Face Recognition, Ahmed Aldhahab
High Performance Techniques For Face Recognition, Ahmed Aldhahab
Electronic Theses and Dissertations
The identification of individuals using face recognition techniques is a challenging task. This is due to the variations resulting from facial expressions, makeup, rotations, illuminations, gestures, etc. Also, facial images contain a great deal of redundant information, which negatively affects the performance of the recognition system. The dimensionality and the redundancy of the facial features have a direct effect on the face recognition accuracy. Not all the features in the feature vector space are useful. For example, non-discriminating features in the feature vector space not only degrade the recognition accuracy but also increase the computational complexity. In the field of …
Calibrating A System Dynamic Model Within An Integrative Framework To Test Foreign Policy Choices, Carlos Kavetsky
Calibrating A System Dynamic Model Within An Integrative Framework To Test Foreign Policy Choices, Carlos Kavetsky
Electronic Theses and Dissertations
Political science uses international relations (IR) theory to explain state-actor political behavior. Research suggests that this theoretical framework can inform a predictive model incorporating features of systems dynamics (SD) and agent based (AB) modeling. The Foreign Policy Model (ForPol) herein applies Alexander Y. Lubyansky's (2014) SD model for macro-political behavior to represent behaviors between real systems and mental models. While verifying and validating the resulting SD/AB/IR holistic model requires an extensive comprehensive research agenda, the present work will take a closer examination at input parameter calibration and conducting typical runs of the SD portion of the model as a first …
Precision Metrology Of Laser Plasmas In The Xuv Band, John Szilagyi
Precision Metrology Of Laser Plasmas In The Xuv Band, John Szilagyi
Electronic Theses and Dissertations
The XUV band, a region of light spanning the wavelength range of 5 - 200 nm, is located between the Ultraviolet and X-ray regions of the electromagnetic spectrum. It is further divided into a 100 - 200 nm region called the Vacuum Ultraviolet (VUV), and a 5 – 100 nm region called the Extreme Ultraviolet (EUV). Applications of this light have been slow to develop due to the lack of suitable sources, efficient optics, and sensitive detectors. Recently, many industries such as the semiconductor manufacturing industry, medical surgery, micromachining, microscopy, and spectroscopy have begun to benefit from the short wavelengths …
Field Evaluation Of Insync Adaptive Traffic Signal Control System In Multiple Environments Using Multiple Approaches, Md Shafikul Islam Shafik
Field Evaluation Of Insync Adaptive Traffic Signal Control System In Multiple Environments Using Multiple Approaches, Md Shafikul Islam Shafik
Electronic Theses and Dissertations
Since the beginning of signalization of intersections, the management of traffic congestion is one of most critical challenges specifically for the city and urbanized area. Almost all the municipal agencies struggle to manage the perplexities associated with traffic congestion or signal control. The Adaptive Traffic Control System (ATCS), an advanced and major technological component of the Intelligent Transportation Systems (ITS) is considered the most dynamic and real-time traffic management technology and has potential to effectively manage rapidly varying traffic flow relative to the current state-of-the-art traffic management practices. InSync ATCS is deployed in multiple states throughout the US and expanding …
A Triangulation Based Coverage Path Planning For A Mobile Robot With Circular Sensing Range, Vatana An
A Triangulation Based Coverage Path Planning For A Mobile Robot With Circular Sensing Range, Vatana An
Electronic Theses and Dissertations
In this dissertation, two coverage path planning (CPP) approaches for a nonholonomic mobile robot are proposed. The first approach is the Local Coverage Path Planning (LCPP) approach which is designed for all sensing ranges. The second approach is the Global Coverage Path Planning (GCPP) approach which is designed for sufficient sensing range that can observe all points of interests in the target region (TR). The LCPP approach constructs CP after finding observer points for all local regions in the TR. The GCPP approach computes observer points after CP construction. Beginning with the sample TR, the LCPP approach requires 8 algorithms …